Texas Instruments SN74ABT125PWRE4

Overview

SN74ABT125PWRE4 from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for high-speed TTL-compatible data routing in industrial and embedded systems. It delivers −32-mA high-drive IOH and 64-mA IOL, supports hot insertion via Ioff and power-up 3-state logic, and operates across −40°C to 85°C at 4.5–5.5 V supply. Its TSSOP-14 package enables dense PCB layouts in memory address/data bus isolation applications.

For engineers reviewing the SN74ABT125PWRE4 datasheet, SN74ABT125PWRE4 pinout, SN74ABT125PWRE4 application, or SN74ABT125PWRE4 equivalent, key selection criteria include output drive strength (−32/64 mA), ground bounce performance (<1 V VOLP), hot-swap capability, thermal resistance (113°C/W), and compatibility with 5-V TTL and CMOS logic families.

Technical Context

The SN74ABT125PWRE4 implements four independent noninverting buffers, each controlled by a dedicated output-enable (OE) input that places the Y output in high-impedance state when driven high. Its ABT logic family uses advanced bipolar transistor design to achieve fast propagation delays (1–6.5 ns) while maintaining robust noise immunity and latch-up resistance (>500 mA per JESD-17).

Power management features include Ioff circuitry that disables outputs during power-down to prevent backflow current, and power-up 3-state logic that holds outputs high-Z during VCC ramp-up. OE must be tied to VCC via a pullup resistor to ensure safe startup behavior in hot-insertion systems.

Key Specifications

Pinout & Package

TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed pad optional for thermal enhancement. RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus buffer applications.

Compared with SN74LVC125APWR and SN74AHCT125PWRE4, the SN74ABT125PWRE4 uniquely combines 5-V TTL compatibility, −32/64 mA drive, and certified hot-insertion capability-making it the only option among the three qualified for industrial backplane and memory expansion use cases demanding robustness and speed.

Availability

SN74ABT125PWRE4 is available at Aetrix Electronics and suitable for industrial control I/O expansion, memory bus isolation, and backplane data routing requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.

Supply support for SN74ABT125PWRE4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of experience delivering high-reliability components for industrial, automotive, and communications markets.

The SN74ABT125PWRE4 belongs to TI's ABT logic family, engineered specifically for high-speed, high-drive 5-V bus interfacing in mission-critical industrial and telecom infrastructure where signal integrity and hot-swap resilience are mandatory.

FAQ

What is the maximum output current rating for SN74ABT125PWRE4?

The SN74ABT125PWRE4 supports −32 mA high-level output current (IOH) and 64 mA low-level output current (IOL) under recommended operating conditions (VCC = 4.5–5.5 V, TA = −40°C to 85°C). These values are specified per output and validated per JEDEC test methods; simultaneous full-load operation across all four channels requires careful thermal design due to θJA = 113°C/W in the TSSOP-14 package.

Does SN74ABT125PWRE4 support hot insertion, and how is it implemented?

Yes, SN74ABT125PWRE4 supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0 V to prevent damaging current backflow, and power-up 3-state logic forces outputs into high-impedance during VCC ramp-up/down. To ensure reliable operation, OE pins must be pulled up to VCC with a resistor sized per the driver's sink capability-typically 1–10 kΩ depending on system noise and rise time requirements.

What are the absolute maximum ratings for SN74ABT125PWRE4 supply and input voltages?

The absolute maximum ratings for SN74ABT125PWRE4 are: supply voltage VCC = −0.5 V to 7 V; input voltage VI = −0.5 V to 7 V; and output voltage VO = −0.5 V to 5.5 V in high or power-off states. Exceeding these limits-even momentarily-may cause permanent damage. These stress ratings do not imply functional operation; the device is only guaranteed to operate correctly within the recommended ranges (VCC = 4.5–5.5 V, VI = 0–VCC).

How does SN74ABT125PWRE4 handle ground bounce, and what is its typical value?

SN74ABT125PWRE4 is characterized for low ground bounce (VOLP) of <1 V at VCC = 5 V and TA = 25°C, measured under worst-case simultaneous switching conditions. This performance is achieved through optimized internal layout and output stage design, reducing common-ground noise coupling during high-speed parallel data transfers-critical for maintaining signal integrity in memory and bus applications.

What is the thermal resistance (θJA) of SN74ABT125PWRE4 in its TSSOP-14 package?

The junction-to-ambient thermal resistance (θJA) of SN74ABT125PWRE4 in the TSSOP-14 (PW) package is 113°C/W, measured per JESD 51-7 on a standard 4-layer JEDEC test board. This value assumes no thermal pad soldering; adding a copper thermal pad beneath the exposed die pad can reduce θJA significantly-TI recommends minimum 80% solder coverage for optimal thermal performance in high-duty-cycle applications.